Modulation of Attosecond Beating by Resonant Two-Photon Transition

Álvaro Jiménez Galán, Luca Argenti, Fernando Martín
2015 Journal of Physics, Conference Series  
We present an analytical model that characterizes two-photon transitions in the presence of autoionising states. We applied this model to interpret resonant RABITT spectra, and show that, as a harmonic traverses a resonance, the phase of the sideband beating significantly varies with photon energy. This phase variation is generally very different from the $\pi$ jump observed in previous works, in which the direct path contribution was negligible. We illustrate the possible phase profiles
more » ... ase profiles arising in resonant two-photon transitions with an intuitive geometrical representation.
doi:10.1088/1742-6596/635/1/012005 fatcat:5ml4ihawxffpdmy4lvsslyb7pi